42188690 has 8 divisors (see below), whose sum is σ = 75939660. Its totient is φ = 16875472.

The previous prime is 42188687. The next prime is 42188711. The reversal of 42188690 is 9688124.

It can be written as a sum of positive squares in 2 ways, for example, as 40998409 + 1190281 = 6403^2 + 1091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×42188690² = 3559771127832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2109425 + ... + 2109444.

Almost surely, 2^42188690 is an apocalyptic number.

42188690 is a deficient number, since it is larger than the sum of its proper divisors (33750970).

42188690 is a wasteful number, since it uses less digits than its factorization.

42188690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218876.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 42188690 is about 6495.2821339800. The cubic root of 42188690 is about 348.1224356699.

The spelling of 42188690 in words is "forty-two million, one hundred eighty-eight thousand, six hundred ninety".